I didn't waste money on the treasure maps. I just searched every room and building. I had enough money to fully upgrade the Red 9, Rifle, Broken Butterfly, and Striker. I didn't upgrade any of the other guns at all. I purchased rocket launchers for every boss fight. I also had enough money for the XL case.
I currently need to boost for Turok, Burnout Revenge, Splinter Cell DA, Saints Row 2, GTA IV, Dead or Alive 4, Catan, Left for Dead & Castle Crashers. I'm available every Thursday, Friday, and Saturday. My gamertag is Crypt Lurker.